blettner



e. H. BLETTNER. I

METHOD OF MAKING PIST ON RINGS AND OF MAKING A TEMPLATE THEREFOR.

APPLICATION FILED MAR. I0. ma

1 ,403,4=79, Patented Jan. 17, 1922.

3 SHEETS-SHEET h G. H. BLETTNER.

METHOD QF MAKING PISTON RINGS AND OF MAKING A TEMPLATE THEREFOR. APPLICATION FILED MAR. no, I919.

1,403,479.. Patentd m. 17,1922.

3 SHEETS-SHEET 2- G. H. BLETINER.

METHOD OF MAKING PISTON muss AND OF MAKING A TEMPLATE THEREFOR.

APPLICATION FILED MAR. 10, I919.

1 ,403,4;79, Patented Jan. 17,1922.

' a SHEETS-SHEET a.

EW W UNITED METHOD Q15 lillfsllfltllil llflll l incense.

Application filed Tiller-eh ltd, Ll.

To call whom may concern.

lie it known that l, llnonon l-l Bnnrrirnin e citizen or the United rltetes, end it resident oi the city oi Uhieego in the county cl Cool; and tritate oi Illinois, have invented certein new end useful improvements i ethcds oif Marking Histon Illings end ol' Melting e 'lernplots 'lhere'l or; and do hereby declare that the following; is 2t lnli, clear rind erect description of the some, reference hein had to the scene )enying drawings, end to the hit inersls oil: relerence in: d thereon, which form it pert of this specnicetion' My invention has reference more porificelerly to on i: eve-d piston ring ttlld con cerns emethod of? melting; seine wherein the ring; reproduced from term which is compressed end shaped end then enpsinds itself to the form in which the ring is to he made, the present epplicstion hei; p; in port at continuetion of my prior eppli-cirition tiled his 5, 1917, irlerizil l'lou 166,551.

Another object of my invention is to theirs it pattern by compressing; :i resilient split ring and so shaping it that when errpzinded by its own resiliency it will tslre the term in which the piston rings ore to be inside My invention conteni l providing 8t ring oil lerp er dienieter 'th the finished ring when compressed in the cylinder winch said larger ring issplit with overlapping parts and shaped :rronnd 2r template or term to the ere *t oi the finished piston ring when placed in position in it cylinder, otter which the said ring is expended by reason of its own resiliency end without forcible expansion and used (t5 e template or term for melting patterns from which piston rings are reproduced.

ll iy invention also has other iniportent ohjects which will eppesr from th :l ollewing specification and accompanying drawings, in which I have described and illustrated my invention in e preferred form.

On the draw-rings;

l igure l. is it sit VlBW of e ring which is used in the development or" the pattern for making the piston rings.

Figure Qshows the ring split and perilo rsted so as to be compressed.

Figure 3 is on edge View of the rinp; show ing the split joint.

Figure l. shows the split ring pieced on n template or form to he corn n'essed and shaped.

mention or Il'ictters Patent.

serial lilo. Flllldltili.

ii M'ULU'ML the t 1} shows as View oi the tent V f ll. sheping; more i shows the ring r Ll eroded the i e in ieenpsnded which it when released lilf" resiliency.

8 shows the ring; in the expended I lQll ill:

therein l ip'ure 9 is on edge View elf the template.

it) 7, :1 side V ew of tie teniplste e solid rin in the process oi being; in the pfillpllmfj f oi" the teinplete which is inzide to View oil the ring; with one which permits coni is 2 side View oi? the ring conti cted in true circnlsr 'l'orre ready for use in in cylinder.

it} is on edge View oi the piston re l5 showing the oint thereof. s Sl( vn on the drawings:

l he reference numeral 1h indicates (t rim); inewhst resilient materiel which mi he tni ied out in at lathe or otherwise insole. 'll'iis ring is then drilled F2, after which it out circnin' "'entinll y its at 3, end has it section cut out ill each side thereed is at 4-. 1. erinit contraction oi the ring from .iel sine and provide overlapping: rin corresponding}: perforations e 'hc hole 94. A form or it circnler portion 6, 0i :he interior of the finished she contracted lorin it {its in the circular term 6. l

p v shaping th around the term G it is held i at. tendency to er iend and precy only shop! no; of thering; required rorm (3,. is the fitting}: 0; the over- 1 ends 910, ct: ri by hammering wise so as to conrorin to the Clll'Vitthe form ll.

As soon as the ring is released and removed from the form 6, it enpands by reason of its own resiliency to the original size as shown in Figure 7, so that the perforations 21, return in alignment and a pin 7, may be readily passed through these perforations of the overlapped portions of the ring, to hold the'ring securely in position and prevent displacement of the ends during the further use of the ring.

Owing to the shaping of the ring about the form 6, when the ring expands, the overlapped en-ds retain the curvature ot the form and'when expanded result in an irregularity in the curvature at the intersection of the overlapped ends, atfording a dip or flattened place substantially at the center of the intersecting portions 20, where the pin 7 is located.

A template 8, is then carefully formed so as to accurately fit the inner periphery of the expanded split ring shown in Figure 7, as indicated in Figure 8, which said template will have a corresponding flattened place at the intersection of the overlapped ends of the ring and which is indicated by the arrow at 9.

The template 8, is then used in the making of imperfect rings to he used as patterns, preferably by providing solid rings 10, which may be cut from a tube or pipe of the proper diameten'and these rings are then forced and shaped upon the-template 8, as shown in Figures 10 and 11, so that when removed therefrom, they will retain the shape which they have when on the template and a mark 11, is placed on the ring 10, opposite the arrow 9, on the template to indicate-the. center point of the joint in the original ring.

A number of these rings 10, are then mounted upon the follower board 12, in the usual manner, so as to have castings made therefrom, the mark 11, being impressed or otherwise provided therein sothat a corresponding mark will be made in the casting. Solid rings 13, are then cast from the pattern having the mark 14;, corresponding to the mark 11, of the pattern, which mark indicates where the joint in the ring is to be made, and'the ring is then cut at this point and provided with overlapping portions 15, as shown in Figure 14, or otherwise constructed so that the ring may be compressed as shown in Figures 15 and 16 in a true circular form. V V

The portion out from the ring is suilicient to permit the ring to be compressed to a true circular form and the ring is then compressed and held in the true circular form and milled on the outside so as to lit snugly in the cylinder,and owing to the manner in which thering is constructed, the inner periphery of the ring will fit properly in the groove of the piston without machining,

and it is only necessary to smooth up the inner periphery leaving the skin resulting from the casting of the ring, and this rcsults not only in economy of manufacture, but also in a tougher piston ring.

In the making of piston rings heretofore. it has been customary to form a solid ring at the size of the linishod piston ring, when compressed and then split the ring and wedge the ends thereof apart to provide a pattern or form to be used in makingpiston rings. The rings thus made have a section cut out corresponding to the sertion inserted in the form so that the new ring may be compressed to the size of the original ring. lilowever, in makin a piston ring in this manner, the form or pattern is distorted, owing to the :ic-rcihle separation oi the ends thereof by the placing of the section there between, which this distortion is accordingly reproduced in the blank from which the finished piston r'ngs are to he made, with the result that when the blanks have the section cut out therefrom, and are compressed, a uniform circular :form is not obtained, and the piston ring does not lit accurately in the cylinder and with a uniform pressure against the walls thereof.

lVith my method of constructing, however, the piston ring term or pattern after being shaped properly, expands owing to its own resiliency and assi a natural position without any distoitingeilii'ect-thercon, and the resulting ring hlank made from this form, when the section is cut out thereof, ma be compressed into circular form and provides a ring which fits accurately in the cylinder with a uniform pressure on the walls thercoi and uniformly fills the groove of the piston.

lVhile l have shown and described my invention in a preferred form, I am aware that various changes and modifications may he made therein witl'iout departing}: trom the principles of? my invention, and l: therefore do not purpose limiting the patent granted hereon otherwise than neressitatcd by the scope of the appended claims.

l claim my invention:

1. The method oi making a template for piston rings which consists in drilling a hole through a circular ring. splitting: said ring so i provide overlapping parts pierced by s d hole. ron'iprcssing the ring h desired piston rings, alterins" wl 'l (SOIHUCCSS OIrtllQ unstrainc id ring. releasing the ring, pass on a iastoninpi means through the ring in its unstraincd ting! a template to the unsaid hole to form, and lit strained ring.

2. The process of forming a template for patterns for piston rings which consists in constraining a split ring to a circular form of the desired size, giving the end portion of the constrained ring a permanent set to the radius they have in the eonstrelned poeition, allowing the ring to expand and fitting 2i template to the expanded ring.

the process oi iorrning a template ior patterns for piston rings which consists in.

eonstminingr a, split ring to e eireular form of the desired size, hammering the ring to give its ends :1 permanent set to the radius (it said site permitting the ring to expand and fitting a template to the expended ring.

at. The precess of making piston rings which consists in producing an rinstmined ring of non-circular curvature, fitting e tempiete thereto marking the template at point of smallest radius, making from said tenipiete a ring" pattern and from said pattern a moid, making in said mold a mark eerrespending to the mark on said template ee ting rings in said mold and splitting said M; tiiei'nztrke thereon. in testimony whereof it have hereunto subscribed my name in the presence of two enhseribinp;Witnesses,

GEORGE H BLETTNER. VVitnessee EARL M. HARDINE, CHARLES W IIILLS, Jr. 

